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Stock-Based Compensation (Tables)
6 Months Ended
Sep. 30, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Summary of Stock-Based Compensation Expense
The following table summarizes stock-based compensation expense by financial statement line item for the three and six months ended September 30, 2018 and 2017 (in thousands):
 
Three months ended September 30,
 
Six months ended September 30,
 
2018
 
2017
 
2018
 
2017
Cost of revenues
$
50

 
$
23

 
$
90

 
$
59

Research and development
70

 
61

 
121

 
110

Selling, general and administrative
705

 
394

 
1,399

 
1,063

Total
$
825

 
$
478

 
$
1,610

 
$
1,232